trance565

iTrader: (4)

okay, it's not a chevy, it's a 1970 olds, but i figure the solution would be the same regardless.

we were replacing the stock intake manifold and carb on a 1970 442 w/ a BB 455, and the far front passenger side bolt hole on the head got stripped.

i had hand tightened it down till the bolt head was hitting the washers, so it wasn't cross threaded. when i started to actually tq it down, i might have gotten to 15-20ftlb before it decided it was gonna give way.

anyways, im looking at the bolt hole, and it looks a bit different, like maybe it had been sleeved or heliocoiled before or something. the top of the bolt hole has 2 slits, one on each side, while the rest just have threads the whole way.

i've tried to tap it, but i cant get the tap started. any suggestions?

trance565

iTrader: (4)

this is a good bolt hole (11/12 of them are like this)


this is the bad one (1/12 are like this -.-)

cambirdracing

iTrader: (4)

Helicoil is the only solution or at least the best

trance565

iTrader: (4)

so more or less, let someone drill out the sleeve and redo it?

supermouse4

I would agree with the previous posters and have someone drill it out a sleeve and put in a threaded insert.